/Engine/Plugins/Editor/EditorScriptingUtilities/Source/EditorScriptingUtilities/Public/EditorStaticMeshLibrary.h
Adds or create a LOD at DestinationLodIndex using the geometry from SourceStaticMesh SourceLodIndex
The index of the LOD that was set. It can be different than DestinationLodIndex if it wasn't a valid index. A negative value indicates that the LOD was not set. See log for explanation.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="Editor Scripting | StaticMesh", Meta=(DeprecatedFunction, DeprecationMessage="The Editor Scripting Utilities Plugin is deprecated - Use the function in Static Mesh Editor Subsystem")) static int32 SetLodFromStaticMesh ( [UStaticMesh](API\Runtime\Engine\Engine\UStaticMesh) * DestinationStaticMesh, int32 DestinationLodIndex, [UStaticMesh](API\Runtime\Engine\Engine\UStaticMesh) * SourceStaticMesh, int32 SourceLodIndex, bool bReuseExistingMaterialSlots )